Discussion
A Frise aileron reduces adverse yaw by
Answer: B
Correct answer: Projecting its nose into the flow
A Frise aileron is hinged behind its leading edge, so when it deflects upward the nose of the surface projects below the wing's lower surface into the airflow.
That projection adds profile drag on the up-going wing, offsetting the induced drag added on the down-going one, and so reduces adverse yaw. It also lightens the stick force by helping to balance the hinge moment. The mechanism is quite different from differential rigging, which changes the travel; the Frise changes the flow around the surface itself.
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